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Biblioteca (s) : |
INIA Tacuarembó. |
Fecha : |
11/09/2014 |
Actualizado : |
13/05/2020 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Autor : |
DE BARBIERI, I.; HEGARTY, R.S.; ODDY, V.H.; BARNETT, M.C.; LI, L.; NOLAN, J.V. |
Afiliación : |
LUIS IGNACIO DE BARBIERI ETCHEBERRY, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ROGER S. HEGARTY, School of Environmental and Rural Science, University of New England, Trevenna Road, Armidale, NSW 2351, Australia; V. HUTTON ODDY, Beef Industry Centre, Department of Primary Industries NSW, Trevenna Road, Armidale, NSW 2351, Australia; MARK BARNETT, School of Environmental and Rural Science, University of New England, Trevenna Road, Armidale, NSW 2351, Australia; L. LI, School of Environmental and Rural Science, University of New England, Trevenna Road, Armidale, NSW 2351, Australia; JOHN V. NOLAN, School of Environmental and Rural Science, University of New England, Trevenna Road, Armidale, NSW 2351, Australia. |
Título : |
Sheep of divergent genetic merit for wool growth do not differ in digesta kinetics while on restricted intakes. |
Fecha de publicación : |
2014 |
Fuente / Imprenta : |
Animal Production Science, May 2014, v. 54, no. 9, p. 1243-1247. DOI: https://doi.org/10.1071/AN14319 |
DOI : |
10.1071/AN14319 |
Idioma : |
Inglés |
Notas : |
Received 12 March 2014; accepted 12 May 2014; published online 10 July 2014. Acknowledgements: The authors thank Evelyn Osborne, Jose Velazco, Alistair Donaldson, Carolina Silveira, Gary Cluley, Leanne Lisle, Sue Mortimer and Andrew Blakely for their technical support. Ignacio De Barbieri was supported by National Institute for Agricultural Research (INIA Uruguay). |
Contenido : |
Sheep selected for high wool growth were previously shown to exhibit higher microbial protein outflow from the rumen and higher uptake of amino nitrogen in portal blood than those selected for low wool growth. This suggests that genetic selection for wool growth may induce changes in foregut physiology. This study was undertaken to determine whether differences in digesta kinetics, especially mean retention mime (MRT), are associated with differences in fleece production between sheep with low or high estimated breeding values (EBVs) for fleece weight. Twenty mature Merino wethers with uniform EBVs for liveweight were allocated to two groups of 10 animals on the basis of high or low EBVs for yearling fleece weight. Five sheep with low-EBVs and five sheep with high-EBVs for fleece weight groups were allocated in a crossover design to low and high feeding-level treatments, which comprised a blended hay diet fed at maintenance or 1.5 times maintenance. All sheep were given single doses of chromium-mordanted fibre and cobalt-EDTA as inert, non-digestible markers. Digesta kinetics was determined by analysis of the faecal marker excretion patterns using
a compartmental model. Higher feed intakes from animals fed 1.5 times maintenance were associated with higher rates of wool growth and higher masses of indigestible fibre in the gut, but reduced MRT of digesta. Although sheep with higher EBVs for fleece weight had higher wool growth rates, there was no indication that these wool growth differences were associated with differences in digesta kinetics. The lack of interaction between feeding level and genotype suggests that MRT did not contribute to genotype differences in wool growth in sheep fed restricted intakes. The differences in wool growth among commercial Merino sheep with divergent fleece weight EBVs achieved by multi-trait selection are not attributable to differences in digesta kinetics, at least when feed is not available ad libitum. MenosSheep selected for high wool growth were previously shown to exhibit higher microbial protein outflow from the rumen and higher uptake of amino nitrogen in portal blood than those selected for low wool growth. This suggests that genetic selection for wool growth may induce changes in foregut physiology. This study was undertaken to determine whether differences in digesta kinetics, especially mean retention mime (MRT), are associated with differences in fleece production between sheep with low or high estimated breeding values (EBVs) for fleece weight. Twenty mature Merino wethers with uniform EBVs for liveweight were allocated to two groups of 10 animals on the basis of high or low EBVs for yearling fleece weight. Five sheep with low-EBVs and five sheep with high-EBVs for fleece weight groups were allocated in a crossover design to low and high feeding-level treatments, which comprised a blended hay diet fed at maintenance or 1.5 times maintenance. All sheep were given single doses of chromium-mordanted fibre and cobalt-EDTA as inert, non-digestible markers. Digesta kinetics was determined by analysis of the faecal marker excretion patterns using
a compartmental model. Higher feed intakes from animals fed 1.5 times maintenance were associated with higher rates of wool growth and higher masses of indigestible fibre in the gut, but reduced MRT of digesta. Although sheep with higher EBVs for fleece weight had higher wool growth rates, there was no indication that these wool gr... Presentar Todo |
Palabras claves : |
ESTIMATED BREEDING VALUES; FEED INTAKE; FLEECE WEIGHT; MEAN RETENTION TIME. |
Thesagro : |
OVINOS. |
Asunto categoría : |
L01 Ganadería |
Marc : |
LEADER 03128naa a2200265 a 4500 001 1050143 005 2020-05-13 008 2014 bl uuuu u00u1 u #d 024 7 $a10.1071/AN14319$2DOI 100 1 $aDE BARBIERI, I. 245 $aSheep of divergent genetic merit for wool growth do not differ in digesta kinetics while on restricted intakes. 260 $c2014 500 $aReceived 12 March 2014; accepted 12 May 2014; published online 10 July 2014. Acknowledgements: The authors thank Evelyn Osborne, Jose Velazco, Alistair Donaldson, Carolina Silveira, Gary Cluley, Leanne Lisle, Sue Mortimer and Andrew Blakely for their technical support. Ignacio De Barbieri was supported by National Institute for Agricultural Research (INIA Uruguay). 520 $aSheep selected for high wool growth were previously shown to exhibit higher microbial protein outflow from the rumen and higher uptake of amino nitrogen in portal blood than those selected for low wool growth. This suggests that genetic selection for wool growth may induce changes in foregut physiology. This study was undertaken to determine whether differences in digesta kinetics, especially mean retention mime (MRT), are associated with differences in fleece production between sheep with low or high estimated breeding values (EBVs) for fleece weight. Twenty mature Merino wethers with uniform EBVs for liveweight were allocated to two groups of 10 animals on the basis of high or low EBVs for yearling fleece weight. Five sheep with low-EBVs and five sheep with high-EBVs for fleece weight groups were allocated in a crossover design to low and high feeding-level treatments, which comprised a blended hay diet fed at maintenance or 1.5 times maintenance. All sheep were given single doses of chromium-mordanted fibre and cobalt-EDTA as inert, non-digestible markers. Digesta kinetics was determined by analysis of the faecal marker excretion patterns using a compartmental model. Higher feed intakes from animals fed 1.5 times maintenance were associated with higher rates of wool growth and higher masses of indigestible fibre in the gut, but reduced MRT of digesta. Although sheep with higher EBVs for fleece weight had higher wool growth rates, there was no indication that these wool growth differences were associated with differences in digesta kinetics. The lack of interaction between feeding level and genotype suggests that MRT did not contribute to genotype differences in wool growth in sheep fed restricted intakes. The differences in wool growth among commercial Merino sheep with divergent fleece weight EBVs achieved by multi-trait selection are not attributable to differences in digesta kinetics, at least when feed is not available ad libitum. 650 $aOVINOS 653 $aESTIMATED BREEDING VALUES 653 $aFEED INTAKE 653 $aFLEECE WEIGHT 653 $aMEAN RETENTION TIME 700 1 $aHEGARTY, R.S. 700 1 $aODDY, V.H. 700 1 $aBARNETT, M.C. 700 1 $aLI, L. 700 1 $aNOLAN, J.V. 773 $tAnimal Production Science, May 2014$gv. 54, no. 9, p. 1243-1247. DOI: https://doi.org/10.1071/AN14319
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INIA Tacuarembó (TBO) |
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Biblioteca (s) : |
INIA La Estanzuela; INIA Tacuarembó. |
Fecha actual : |
21/02/2014 |
Actualizado : |
22/02/2014 |
Autor : |
Sanz Antía, J.E. |
Título : |
Siembra en cobertura de Lotus Subbiflorus en pasturas naturales sobre suelos de la unidad Polanco |
Fecha de publicación : |
1990 |
Fuente / Imprenta : |
ln: Seminario Nacional de Campo Natural, 2 : 1990 nov 15-16 : Tacuarembó Montevideo (Uruguay): Hemisferio Sur, 1990. |
Páginas : |
p265 |
Idioma : |
Español |
Notas : |
Participaron del Seminario INIA, Sociedad Uruguaya de Pasturas Naturales, Facultad de Agronomía, Plan Agropecuario |
Thesagro : |
LOTUS; PASTIZAL NATURAL; PLANTAS FORRAJERAS; URUGUAY. |
Asunto categoría : |
-- |
Marc : |
LEADER 00692naa a2200181 a 4500 001 1048585 005 2014-02-22 008 1990 bl uuuu u00u1 u #d 100 1 $aSANZ ANTÍA, J.E. 245 $aSiembra en cobertura de Lotus Subbiflorus en pasturas naturales sobre suelos de la unidad Polanco 260 $c1990 300 $ap265 500 $aParticiparon del Seminario INIA, Sociedad Uruguaya de Pasturas Naturales, Facultad de Agronomía, Plan Agropecuario 650 $aLOTUS 650 $aPASTIZAL NATURAL 650 $aPLANTAS FORRAJERAS 650 $aURUGUAY 773 $tln: Seminario Nacional de Campo Natural, 2 : 1990 nov 15-16 : Tacuarembó Montevideo (Uruguay): Hemisferio Sur, 1990.
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